{
  "manageEntity": {
    "action": "Save",
    "entityId": "990693201",
    "entityType": "Track",
    "nonce": "0x85510d14c1dd1831b6c24d33428df0fcefb7be59a88e978c336443e3ee43679f",
    "signature": "0x63b360b8038a0f3020d061310d2c567fb3833b2d200430e2e2eb6eb55cfc90ff318975d71e0908dfa634412b3893d02333916a6b168e8d51ee650d0e5c1fb7a91b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}